3.6 Pentastar coolant temp 222 degrees at idle

[willys 41]

one note
I took the 600 watt fan out of the fan housing and keep it in the jeep just encase the fan 940 watt motor fails
The lager fan blades will bolt to the 600 watt fan motor put you will have to trim about 1/8 of plastic to get it to spin. It will not affect the strength large fan blade

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[Hootbro]

one note
I took the 600 watt fan out of the fan housing and keep it in the jeep just encase the fan 940 watt motor fails
The lager fan blades will bolt to the 600 watt fan motor put you will have to trim about 1/8 of plastic to get it to spin. It will not affect the strength large fan blade

So the whole 68340962AC assembly is not a direct bolt on to a 3.6L Gladiator?

Kind of confused what you wrote there, so if I missed something, my apologies.

 

[willys 41]

So the whole 68340962AC assembly is not a direct bolt on to a 3.6L Gladiator?

Kind of confused what you wrote there, so if I missed something, my apologies.

Sorry for the confusion
Yes. The 600 / 850 / and 940 watt all use the same fan shroud
The fan motor and blades are the only difference
So yes an 850 or 940 will bolt right on
What I was tiring say. I kept the 600 watt as a spare or back up if my 940 watt if it ever faild

 

[ShadowsPapa]

What I was tiring say. I kept the 600 watt as a spare or back up if my 940 watt if it ever faild

??

 

[starrskream]

OK, it was late, I was tired, etc.
More accurate thinking on this -
A thermostat sets the minimum operating temperature.
A 195 starts to just barely open at 195 degrees. It won't be fully open until something like 220 (at least that's the old standard)
So 195 is the minimum, all else is set by coolant flow, air flow, load, and more, as far as top temperatures.
How long is it idling to get go 222?
I have a funny feeling the fans on these are set to kick in about that time.
Mine fluctuates between the mid 190s and 220 degrees while driving as a matter of course.
I've not watched idle temperatures, but then there's little idle time around here and mine shuts down at stop lights and stop signs quite often as I let ESS work so I don't have heavy traffic or prolonged idling.
I'd say if that's as hot as it gets - forget it.
If it doesn't go over that at idle, no problem.

It's possible to connect in with something like JSCAN and watch fan operation - even manually kick it on as I recall, just for experimenting.

So consider my prior as being tired and not even thinking things through.
At idle, not moving, there's no air flow and these run pretty tight control over the fan. That makes sense because running the fan is a larger electrical load, meaning more alternator work, meaning more heat generated.
Add that to the fact that 222 isn't even hot - not for any of the fluids.
If you don't get oil up to that temperature for a period of time, you keep the moisture and fuel contamination in and that means shorter oil life and shorter engine life.
You don't have to worry about coolant being too hot as far as boiling until about 260 degrees due to the pressure and the anti-freeze, anti-boil mixture.
To some extent, a hotter engine is more efficient.

absolute correct.
If I may add, pressure dictates boiling points. My old 2009 zx6r temps would hit 225 in parades and heavy traffic. It was never an issue, because of the pressure in the system.

Being a brand new owner myself, I’d likely think as you do. There’s zero harm in pulling up to the service dept at the dealer and asking with the intent to learn. Don’t tell them it’s a problem, just ask about the temps and if you should be worried.

 

[jav_eee]

So the service manual lists engine oil pressures at certain RPM’s with a note: “values in this table are valid for coolant temperature between 89-100B°C (192-212°F)”. I wonder why they specify that temp range. One wonders why they didn’t list the values up to 230° if the engines are indeed designed to run that warm. Right?

(im not sure what that B means. Might be a format/translate issue with the text or something that someone way smarter than me is educated on)

 

[Hootbro]

(im not sure what that B means. Might be a format/translate issue with the text or something that someone way smarter than me is educated on)

Considering that 100 degree Celsius is the boiling point of water at sea level atmospheric pressure, I would assume the "B" means Boiling.?‍

 

[ShadowsPapa]

So the service manual lists engine oil pressures at certain RPM’s with a note: “values in this table are valid for coolant temperature between 89-100B°C (192-212°F)”. I wonder why they specify that temp range. One wonders why they didn’t list the values up to 230° if the engines are indeed designed to run that warm. Right?

Wrong.

Stop wondering - you want it all the way up to 250 degrees? For all oil brands and types?

They have no need as long as your pressures are within that range at the temperatures specified.
You may have slightly lower pressures, but why take the thing out to the Nth degree?
A lot of what happens outside of that range will depend a bit on the exact oil you use.

Looks like people are trying to find reasons to find fault with temps in the 220s - and yet, it's been normal for as long as I've been a mechanic.
Yes, B is boiling at sea level with no antifreeze involved.
The coolant increases the boiling point by itself, then the pressure on the system increases the boiling point to somewhere in the 260 range.
As long as you have a proper pressure cap and the system holds pressure and your coolant mix is correct, it's not going to boil below 250.

Those tables aren't absolute, they are giving guidelines, this is where it would be at these temperatures.

I've had mine running over 225 degrees and my oil pressure stayed at 27 or above.

Just seems like people are looking for a reason to not believe something, digging hard.

 

[jav_eee]

Wrong.

Stop wondering - you want it all the way up to 250 degrees? For all oil brands and types?

That’s a pretty strong answer for anyone not in in the engineering/development loop of the engine. What other parts of the manual were you involved in writing aside from this one?

No I don’t want it to cover every degree the engine will see, just the normal operating range. There has to be a reason for them to specify a certain range. I doubt it was a “let’s spin the wheel and whatever 2 numbers we get is what we’ll set the upper and lower limits of this guideline at”.

 

[ecidiego]

The Jeep will trip a fault and go into limp mode if it's too hot. No warnings = you're fine. Moving more air is always good...it means the cooling system will be able to keep up in worse temps. Worring about idle temp if the ECU isn't = worthless

 

[ShadowsPapa]

That’s a pretty strong answer for anyone not in in the engineering/development loop of the engine. What other parts of the manual were you involved in writing aside from this one?

No I don’t want it to cover every degree the engine will see, just the normal operating range. There has to be a reason for them to specify a certain range. I doubt it was a “let’s spin the wheel and whatever 2 numbers we get is what we’ll set the upper and lower limits of this guideline at”.

Call it experience.
People also get all worried about oil pressure.
one reason to not take it out more is people will get all bent out of shape over oil pressure numbers they don't like.
They could take that chart out farther, but to what end?

That chart is a guide for troubleshooting - you should see these numbers under these conditions. It's not stating that anything over 100 degrees is abnormal. It's a chart where they are using numbers very easily to obtain in a shop.
Look at the wide ranges of RPMs and the wide ranges of pressures - it's a go-no go chart more than anything. It's not speaking to normal temps, it's speaking to oil pressures you should see under xx conditions.
If it meets what you see there, why worry about the other ends?
It's not saying over 100 is too hot, it's saying these are the pressures you should see under these conditions.
Read it as an oil pressure guide, not an engine temperature guide.

Look at the other parts of that chart - do YOU as a driver care about the finish on the cylinder walls or head trueness?
Don't read into it what isn't intended.

 

[willys 41]

Do you not go off road because you may brake front axle U-joint and blow apart your aluminum knuckle
NO
You replace the axles with RCV axles and cast iron knuckle
This is called a weak point in the jeep design
Same with the jeep cooling system. It is a weak point in the jeep design

 

[TinMan2020]

Just to throw my two cents in:

today:

Idle: 222 (fan kicks on and drops)

in traffic: 205

interstate: 195

now (the reason I’m here) I climbed a small but steep mountain road and my temp hit mid 230s.

should I worry?

the temp gauges never moved past half way. I only started looking at the actual temp this week. Has 5,000 miles on it.

 

[ShadowsPapa]

Just to throw my two cents in:

today:

Idle: 222 (fan kicks on and drops)

in traffic: 205

interstate: 195

now (the reason I’m here) I climbed a small but steep mountain road and my temp hit mid 230s.

should I worry?

the temp gauges never moved past half way. I only started looking at the actual temp this week. Has 5,000 miles on it.

No.
It was a steep grade, likely a warm day, and at high altitudes there's less air density to remove heat from the radiator, fan or no fan.


Altitude and ambient (outside air) temperatures matter.
Couple that with the load of going up the grade.....

Looks totally normal to me.

 

[willys 41]

Just to throw my two cents in:

today:

Idle: 222 (fan kicks on and drops)

in traffic: 205

interstate: 195

now (the reason I’m here) I climbed a small but steep mountain road and my temp hit mid 230s.

should I worry?

the temp gauges never moved past half way. I only started looking at the actual temp this week. Has 5,000 miles on it.

You want to fix your high coolant and oil temps.
Do what I and others have done and install a RPM Extreme JL fan controller.
After I installed mine no more 235 degrees coolant temps or high oil temps.
Average coolant temps 188 to 195. Oil temps down by 25 degrees.
I have been running mine for about a year and the highest temps I have seen for only a few minutes was 212 climbing a mountain pass from 4000 ft. to 8000 ft. coming back from Moab.
Its a game changer.

http://www.rpmextreme.com/Product/311/Jeep-JL-PWM-FAN-CONTROLLER.aspx

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